【題目】---How long has the nationwide ban(禁止) on plastic bags been put into practice?

---__________ the beginning of June.

A. Behind B. Since C. Among D. At

【答案】B

【解析】句意:-全國禁止使用塑料袋的禁令推行了多長時間了?-自從6月初開始。Behind后面;Since自從;Among中間;At在具體的時間點。How long是對一段時間提問的,since表示自從開始,表示的是一段時間,故選B。

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